:farmer: compiler warnings from ignored rmw_publish and rmw_take_event return values

[miguelgonrod]

Generated by Generative AI

No response

Operating System:

Ubuntu Resolute and rhel

ROS version or commit hash:

Rolling

RMW implementation (if applicable):

No response

RMW Configuration (if applicable):

No response

Client library (if applicable):

No response

'ros2 doctor --report' output

Steps to reproduce issue

1. Go to any of the jobs listed below
2. Build a job
3. See warnings showing up

Expected behavior

To build without warnings

Actual behavior

Building with warnings

Additional information

Reference Builds

• nightly_linux_repeated#4390
• nightly_linux_debug#3956
• nightly_linux-rhel_repeated#2800
• nightly_linux-rhel_debug#2822
• nightly_linux-aarch64_release#3672
• nightly_linux-aarch64_debug#3680

Log Output

--- stderr: test_rmw_implementation

/home/jenkins-agent/workspace/nightly_linux_repeated/ws/src/ros2/rmw_implementation/test_rmw_implementation/test/test_event_message_lost_deadlock.cpp:148:26:
warning: ignoring return value of ‘rmw_ret_t rmw_publish(const rmw_publisher_t*, const void*, rmw_publisher_allocation_t*)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  148 |         (void)rmw_publish(pub, &msg, nullptr);
      |               ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~

/home/jenkins-agent/workspace/nightly_linux_repeated/ws/src/ros2/rmw_implementation/test_rmw_implementation/test/test_event_message_lost_deadlock.cpp:159:29:
warning: ignoring return value of ‘rmw_ret_t rmw_take_event(const rmw_event_t*, void*, bool*)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  159 |         (void)rmw_take_event(&event, &status, &taken);
      |               ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

---

Finished <<< test_rmw_implementation [1min 32s]

Began to happen in https://ci.ros2.org/job/nightly_linux_repeated/4389. Probably caused by #278

CC: @Crola1702